Variant Synonymizer: Platform to identify mutations defined in different ways is available now!

VarSy

Over 2,000 gene–disease validation summaries are now available—no login required!

Browse Summaries

SNCA – Parkinsonian-pyramidal Syndrome

Parkinsonian-pyramidal syndrome (MONDO:0009830) features combined parkinsonism and pyramidal signs. SNCA (SNCA) encodes alpha-synuclein, an autosomal dominant Parkinson disease gene associated with Lewy body pathology.

In a cohort of 39 indigenous Zambian patients, including one with parkinsonian-pyramidal syndrome, comprehensive SNCA exon sequencing in the syndromic case revealed no pathogenic SNCA coding variants (PMID:22445250). No familial segregation or additional affected relatives with SNCA variants were reported.

Although extensive functional studies demonstrate that PD-linked SNCA mutations accelerate alpha-synuclein fibril formation and disrupt neuronal proteostasis, no disease-specific functional or experimental data support a role for SNCA in parkinsonian-pyramidal syndrome. Given the lack of genetic and functional evidence, routine SNCA testing is not recommended for isolated parkinsonian-pyramidal presentations.

Key Take-home: SNCA involvement in parkinsonian-pyramidal syndrome remains unsubstantiated; evaluate SNCA primarily in established familial Parkinson disease contexts.

References

  • Parkinsonism & related disorders • 2012 • Analysis of LRRK2, SNCA, Parkin, PINK1, and DJ-1 in Zambian patients with Parkinson's disease. PMID:22445250

Evidence Based Scoring (AI generated)

Gene–Disease Association

Limited

Single parkinsonian-pyramidal syndrome proband sequenced with no SNCA variants detected ([PMID:22445250])

Genetic Evidence

Limited

Absence of SNCA coding variants in one syndromic case ([PMID:22445250])

Functional Evidence

Limited

PD-linked SNCA functional assays exist but lack disease-specific data for parkinsonian-pyramidal syndrome